Yahoo! Site Solution requires only that you choose your business category and country. You are not required to enter any other contact details.
We do, however, strongly recommend that you include at least some basic contact information on your web site, such as a mailing address, email address, or phone number. Most businesses create web sites to attract new customers — but you'll have a hard time closing a sale if your new leads can't contact you!
(Note that you'll also need to enter a U.S. or Canada mailing address and an email address if you want to display a map and form on your contact page.)
Site Solution makes it easy to display your contact information on your site. Learn how to update your contact information and show or hide contact details.